6 resultados para Larix gmelinii forest
em Chinese Academy of Sciences Institutional Repositories Grid Portal
Resumo:
CENTURY;; (1) 112. llthm-2403. 07gC.m-2.a-l (2) NPP= (0.3318ln (V/A) +0.4747)30 (l_e-0'0009695E) (3) 2.65 thm-2 (4) C029. 8% (5) (6) (7) (8) (9) 2409.96106US$a-2.52 (10) Va=108.251 06(Tp)0'93
Resumo:
Knowledge about cumulative effects of forest management alternatives on forest landscape is required to make forest management decision. In this paper,a spatially explicit landscape model,LANDIS,was applied to simulate forest landscape changes in 200 years under four management alternatives (no cutting,clearcutting,selective cutting I and II) in Youhao Forestry Bureau located in Small Khingan Mountains. APACK was used to calculate distribution area of the representative species and species age cohort for six species. The results showed:1) timber harvest decreased area percentage of representative conifer species,Pinus koraiensis,Picea koraiensis and Picea jezoensis,Larix gmelinii to some extent compared to no cutting. The most influencing cutting mode for the area percentage of Tilia amurensis and Quercus mongolica was selective cutting II,followed by selective cutting I and clearcutting. To the contrast,the change of area percentage of Betula phatyphylla was contrary to the management alternatives; 2) As to species age cohort composition,timber harvest significantly changed age structure,that is,it decreased over-matured age cohort of representative species,and increased seedling and middle-age cohort (B. phatyphylla was not included,because its area percentage of over-mature age cohort was the highest under clearcutting than other three scenarios).
Resumo:
CO2CO2 WICIWIGLMSGLMGAMCART44SRES-A2202058.1205099.7;SRES-B2202066.4205097.92100 4Thornthwaite memorialThornthwaite memorial
Resumo:
205369Larix olgensis17Larix gmelinii5NH4NO315 g•m-2•a-1 120536933.14 kg•tree-1311.42 kg•tree-1408.46 kg•tree-1>>>>50.16%~69.20%2053693.04 kg•tree-1•a-19.68 kg•tree-1•a-110.21 kg•tree-1•a-140.07%~47.93%27.32%~40.97% 2205369NPKCaMg5308.14 g•tree-12021.01 g•tree-12485.24 g•tree-15Ca>N>K>Mg>P19.74%~34.23%35.16%~45.59% 320536935.31 g•tree-1•a-197.83 g•tree-1•a-1100.08 g•tree-1•a-15Ca>N>K>Mg>PPMgKNCa 4N50.76%~55.11%PK64.38%~68.85%87.85%~90.62%NPK3K>P>N 551.94~78.35 kg•hm-2•a-117.77~29.43 kg•hm-2•a-134.18~48.92 kg•hm-2•a-15Ca>N>K>Mg>PCa>N>Mg>K>P0.624~0.6585MgNCaPKKKK 6NNC/N80.2960.29C/N
Resumo:
The effect of different nitrogen and phosphorus sources on pH and the availability of mineral nutrients in the root/soil interface of Larix gmelinii seedlings were studied by means of root-mat method. The results showed that the addition of NH~+_4-N decreased the pH in the root/soil interface, while the addition of NO~-_3-N increased the pH in contrast with the control treatment. The sort of the P sources and the distance from the root plane remarkably influenced the changes of pH in the root/soil interface induced by the addition of the nitrogen sources. Compared with the addition of only NH~+_4-N, the extent to which the pH in the root/soil interface decreased was obviously smaller when treated by NH~+_4-N and rock P. When treated with different P sources, the contents of available P in the root/soil interface were affected by the sort of the N sources. When treated with soluble P, the contents of the available P in the root/soil interface obviously increased for the addition of both NH~+_4-N and NO~-_3-N. When treated with rock P, the contents of the available P increased only in the area 03 mm from the root plane for NH~+_4-N, whereas the contents of available P in the root/soil interface changed little for NO~-_3-N. The results above showed that the protons excreted by the roots were the main driving force for the solution of the rock P in the root/soil interface. The availability of Fe in the root/soil interface increased as a result of acidity induced by the NH~+_4-N, whereas the availability of Fe in the root/soil interface decreased because of the pH increase induced by the NO_3~-_N. The effect of different N sources on the availability of Fe in the root/soil interface was also affected by the sort of P sources. The concentrations of PFe in the leaves remarkably differed when treated by different NP sources and concentrations of the PFe in the root/soil interface were correlated to those in the leaves of the seedlings.
Resumo:
,,,,Logistic(Pinus koraien-sis)(Larix gmelinii)(Abies nephrolepis)(Picea koraiensis)(P.jezoensis)(Pinus sylvestris var.mongolica)(Relative operating characteristic,ROC),01,ROC0.7,;0.70.9,;0.9,ROC80%,ROC70%80%,67.9%,,,(),,(),,,,,(ROC=78.6%),(ROC=74.4%),,,,(ROC<60%),3,ROC71.7%82.0%,,,(),,,,,
